66872387 has 2 divisors, whose sum is σ = 66872388. Its totient is φ = 66872386.

The previous prime is 66872371. The next prime is 66872411. The reversal of 66872387 is 78327866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66872387 - 2⁴ = 66872371 is a prime.

It is a super-2 number, since 2×66872387² = 8943832286155538, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66872317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33436193 + 33436194.

It is an arithmetic number, because the mean of its divisors is an integer number (33436194).

Almost surely, 2^66872387 is an apocalyptic number.

66872387 is a deficient number, since it is larger than the sum of its proper divisors (1).

66872387 is an equidigital number, since it uses as much as digits as its factorization.

66872387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 47.

The square root of 66872387 is about 8177.5538518557. The cubic root of 66872387 is about 405.8967823062.

The spelling of 66872387 in words is "sixty-six million, eight hundred seventy-two thousand, three hundred eighty-seven".